Improvement in sizing paper



UNrrnn STATES GEORGE E. VAN DERBURGH, OF MAMARONEOK, NEW YORK, AS SIGNORTO OHAS. E. HODGES AND WM. B. NEWBERY, OF DOROHESTER, N. D. SILS- BEE,OF ROXBURY, AND JOHN RICHARDSON, OF BOSTON, MASS.

IMPROVEMENT IN SIZING PAPER.

Specification forming part of Letters Patent No. 412,450, dated April19, 1864.

To all whom it may concern:

Be it known that I, GEORGE E. VAN DER- BURGH, of Mamaroneck, in thecounty of Westchester and State of New York, have invented theapplication of soluble silicate of soda or other alkali for sizing inthe manufacture of paper; and I hereby declare that the followin g isafull, clear, and exact description therof.

The object of this invention is to use a sizin g in the manufacture ofpaper which is considerabl y less expensive than the ordinary sizingnowin use, and to prevent the waste which is occasioned by the frothingv of the latter, While the combination of the usual fillingmaterials-such as clay, &c.-is verymuch facilitated; and this inventionconsists in mixing with the pulp in the engine or feeding-chesta solublesilicate sizing composed ofv the ingredients and in the proportionshereinafter mentioned.

To enable others skilled in the art to understand and apply myinvention, I will now proceed to describe the manner in which it iscarried out.

A solution of an alkaline silicate is used, containing about two andone-half (2%) per cent. of the dry salt of the specific gravityindicated by five (5) degrees of Twaddles hydrometer; or, what is moreconvenient, a concentrated solution of silicate of soda, found in themarket in the form of a thick paste and standing at about 35 to 40 ofBaums hydrotneter, is employed, and to every pound of this paste isadded about twelve pounds of water.

In the manufacture of brown or wrapping paper about three gallons of thedilute solution formed as above is used with every one hundred and fiftypounds of pulp.

In makingwhite paper from six to nine gallons of the said dilutesolution, according to the desired strength and the nature of thematerials, is used with one hundred and fifty pounds of pulp.

It is found that a highly-silicious alkaline silicate produces the bestresults, the soluble silicate ofsoda which is used'with the most successcontaining from twenty-three to twentyseven per cent. of alkali toseventy-seven and seventy-three per cent. of silicic acid, being theproportions of that patented by me on the 29th of May, 1860, andreissued April 1, 1862.

What I claim as my invention, and desire to secure by Letters Patent asan improvement in the manufacture of paper, is-

The application of a sizing of soluble alkaline silicate, substantiallyas set forth.

GEORGE E. VAN DERBURGH.

In presence of- THEODORE J. WHITING, WM. H. RIBLET.

